Scientific review of variola virus research, 1999–2010 [pdf 1Mb]
WHO recommendations for production and control of smallpox vaccine - Revised 2003 [pdf 126 kb]
WHO slide set on the diagnosis of smallpox
Smallpox eradication: destruction of variola virus stocks: report by the WHO Secretariat for 61st Session of the WHO World Health Assembly, April 2008 [pdf, 157kb]
Programme to facilitate Variola virus research
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